Raking classifier



May 18, 1954 c. H. SCOTT RAKING CLASSIFIER 9 Sheets-Sheet 1 Filed Oct. 20, 1952 ATTOR EY y 1954 c. H. SCOTT RAKING CLASSIFIER 9 Sheets-Sheet 5 Filed 001;. 20, 1952 INVENTOR: CHARLES HAROLD SCOTT.

ATTORNEY y 18, 1954 c. H. SCOTT 2,678,721

RAKING CLASSIFIER Filed Oct. 20, 1952 9 Sheets-Sheet 4 N l 2 Q \n g I m t I 9 m 2 E L 2 O s l o i 8 m L m D q \a g n o A o m I I 9 w 1 O l: 2 f 8 Q I "JM N I I II I I m .O 9 (l I N "I N 2 Q I I f -2 .u

\ v 0 (D g g (D w E (O I 2 INVENTORI CHARLES HAROLD SCOTT. a. BY

4 g g w wmgfix ATTORNEY y 1954 c. H. SCOTT RAKING CLASSIFIER 9 Sheets-Sheet 5 Filed 001.- 20, 1952 FIG. l5.

0 CHARLES HAROLD SCOTT,

BY LS ATTOR Mayl8, 1954 c. H. SCOTT RAKING CLASSIFIER 9 Sheets-Sheet 6 Filed Oct. 20, 1952 FIG.|6.

INVENTOR'. CHARLES HAROLD SCOTT,

BY 85; ATTORNEY May 18, 1954 c. H. SCOTT RAKING CLASSIFIER 9 Sheets-Sheet 7 Filed 001;. 20, 1952 INVENTOR ARLES HAROLD SCOT T ATTORNEY 9 Sheets-Sheet 8 Filed 001;. 20, 1952 CHARLES HAROLD SCOTT,

ATTOR Y May 18, 1954 c. H. SCOTT RAKING CLASSIFIER 9 Sheets-Sheet 9 Filed Oct. 20, 1952 LESHAROLDSOOTT:

ATTOR Patented May 18, 1954 UNITED STATES PATENT oFFi-ci:

signer to The DorrGompany,

Stamford, Comm,

a corporation of Delaware Application-(lumber 20, 1952, Serial No. 315,657

13 Claims. 1

This invention relates to classifiers or :the reciprocating rake type adapted to treat a bath of suspended solids for the purpose of fractionating the solids according to size so that an overflow contains suspended solids below a certain or predetermined size called fines, while the fraction of larger sized solids are progressively emerged and delivered from the classifier as sands. Such classifiers comprise a tank. having an inclinedbotton or deck along which longitudinally-extending rake structures are adapted to have reciprocating strokes imparted to them. During a stroke up along the inclined deck, settled solids are conveyed by the rakes. To that. end the rake structures are lowermost and adjacent the deck during rip-deck strokes and are uppermost and away from the deck during down-deck strokes. Thus, the rake structures are adapted to be raised and lowered during the transition between strokes.

So the general problemin the designer such a classifier is to devise an acceptable and satisfactory drive for moving the raking blades upwardly along the inclined .bottomof the tank, raising the raking blades, moving them through a return stroke while. elevated from the tankbottom, descending the blades to the tank ,bottom and then'through their upward stroke again.

One such drive arrangement is shownin Patent No. 2,437,760 granted March 16,1948, to Frank L. Graner and the present applicant, application invention. The mates and bounds of this invenfor which was filed on April 14, 19 i5, and was accorded Serial No. 588,360. Inthatpatent there is shown a shaft extending longitudinally of the tank and mounted'from the tank for rocking. or oscillating about its longitudinal axis witha dwell between each stroke. This rockable oroscillant shaft is provided with ,crossearms pivotally mounted on the shaft and spaced apartlongitudinally along the shaft. With this arrangement, means are provided for rockingtheshaft and meanwhile moving the cross-arms about their pivots. The free ends of the crossarms are provided with hangers which support a rake structure from-the free ends of thearmsQI -One side of the-rockable shaft and another rakestructure from the free-ends on the other side. "The arrangement is such that when one rake structure is moving adjacent the tank bottom on an upstroke, the other rake structure is elevated and is passing through its return stroke.

An object of thisinvention is to devise asatisfactory drive-head construction for accomplishing both the rocking movement of the-shaft and its fixed cross-arms as "well as the proper'longitudinal reciprocable movements'of'the rake struc- Qil ture. The drive-head embodies a rotary mechanism of a composite type for converting its rotary motioninto (1) the rockin motion of the rockable shaft and (2) the reciprocating motion of the rake structures.

Some of the features of this invention include: (I) a novel form of drive-head mechanism; (2) a novel mounting of the drive-head mechanism with respect to the tank and a novelmode of em ploying that mechanism for supporting the rockable shaft; and (3) the drive head mechanism with a housing or cage supported for limited movement about an axis transverse tqthe olassifier and provided with a'bearing for the forward end of the rockable shaft located so that the axis of the shaft is higher than theaxis of the drive mechanism.

The'foreg-oing and several novel featuresoi con.- struction are embodied in the new formoiapparatus constituting the basis of'the invention hereof. Other new and important features of construction will be manifest from the detailed description which follows:

There is'herein disclosed the best embodiment of the invention now known tomeandthatembodimenthas-been chosenior the purpose ofjllustration of the invention-hereof. 'lt will be der scribed preciselywithout attempt to refer to modifications or equivalents whioh however, eanpe used while still falling within the ambit of this tionareset'iorth in the appending claims;:but possibly inless precise language than that employed in the body of the specification.

The embodiment chosen for use in exemplification i illustrated in the accompanyingdrawings constituting apart of this specificatiominwhich:

Fig. lisa plan view of a classifier'gmbodflng theinvention hereof.

Figs. 2a and 21) when brought into alignment collectively provide a verticallongitudinal .sectional view of the classifier asthesame appears whentaken on a vertical plane indicated hy the dot-and-dash line 2- -2 of Fig. 1,-looking in the direction of the arrows. The deep end of t he classifier is the rear overflow portion thereof while theshallow end is theifront. or sands-,discharge portion thereof.

ig. 3 isaneleva n l ide i -.i dica i aby full lines the arrangement and embodimentojim portant novel features pf construction by which e t tu e di at d by, tte n ar soordinatedly raised or lowered or in timed relationip m ved lcneitu nal rie a w rd. c ite ward direction as the case may be.

Fig. 4 is a view looking downwardly at the construction of Fig. 3 in the direction of arrow 4. In Figs. 3 and 4 certain parts of the housing of the drive-head have been broken away so that certain features of construction adapted therefor may be indicated.

Fig. 5 is a longitudinal view, partially in section, of a slideway construction which is employed at the outer end of each set of arms connected to and extending from the rockable shaft. This view also shows a portion of a depending member of the slideway construction by and from which a section of the rake structure derives longitudinal slidable support from a set of rocker arms.

Fig. 6 is a transverse sectional view taken on vertical plane indicated by the broken dot-anddash line 66 of Fig. 5, looking in the direction of the arrows.

Figs. 7 to 10 inclusive are detailed views of a depending member that is included in the slideway construction of Figs. 5 and 6 and from which the rake structure derives carrying support. Of the figures just mentioned, Fig. 10 is a crosssectional view taken on a vertical plane indicated by the dot-and-dash line lO-lll of Fig. 9.

Fig. 11 is a front elevational view partially in section and of which certain parts have been broken away.

Figs. 12a, 12b and 120 collectively constitute a longitudinally and transversely-extending sectional view of the drive-head. This is a view taken as on a plane indicated by the dot-anddash line l2l2 of Fig. 2 or by dot-and-dash line I2I2 of Fig. 13.

Fig. 12a shows an outer broken-off portion of a support tube of 12b.

Fig. 120 illustrates the rear end of a drive link of which the forward end of the link is mounted on the outer end of a crank arm of 12b and of which link the rear end is mounted on a wrist pin on a, rake structur to which the link corresponds.

Fig. 13 is a vertical view of the drive-head looking in a rearward direction toward the front of the classifier. In this view some of the parts of the housing structure and of the mechanism of the drive-head are broken away to show more clearly the arrangement of certain movable parts constituting the assembly of coordinated actuated members of the drive-head.

Fig. 14 is a vertical longitudinal sectional view illustrating portions of the drive-head and while at the same time indicating the location of forward supporting the front end of of the tiltable rocker.

. Fig. 15 is a detail view indicating how a rollercarrying arm which is connected to the front end of the rockable shaft can yield or break upon abnormal conditions being encountered by the shaft or by the parts carried therefrom. v

Fig. 16 is a view looking rearwardly at a turnable grooved cam of the drive-head mechanism.

Fig. 17 is a sectional view looking in an upward direction of the forward grooved portion of the cam. This view is taken as on the dot-and-dash line l1-l7 of Fig. 16 looking in the direction of the arrows.

Fig. 18 is a development of the grooved portion of the cam of Fig. 16.

Fig. 19 is a partial plan view in the general vicinity of the rearmost portion of the rockable shaft.

Figs. 20 and 21 are vertical detailed views, Fig.

4 20 being a view taken as on a vertical longitudinal plane indicated by the dot-and-dash line 2020 of Fig. 19 looking in the direction of the arrows, and Fig. 21 being an upright transverse view looking at the parts of Fig. 20 in th direction of the arrow 2|.

Figs. 22 and 23 respectively provide a vertical longitudinal viewpartially=broken away and an upstanding rear view partially broken away of the liftable rear bearing and hydraulic mechanism for lifting the same and thereby the rear end of the rockable shaft, Fig. 22 being a view taken on a vertically and longitudinally extending plane indicated by the dot-and-dash line 22-22 of Fig. 23 looking in the direction of the arrows and Fig. 23 being an upright view looking forwardly at the structure of Fig. 22 and in the direction of arrow 23.

Fig. 24.- is a perspective view of a housing or cage member employed in a modified form of drive-head mechanism shown in Fig. 25.

Fig. 25 is a perspective view of a modified form of drive-head mechanism.

Reference is now made to the drawings in detail:

The construction illustrated as embodying the invention hereof includes (1) a deep end tank having an upwardly inclined bottom or deck; (2) a pair of longitudinally-extending rake structures arranged side by side and provided with transverse raking blades; (3) a rocker of rigid construction embodying a rockable longitudinal shaft portion and rocker arms extending laterally in opposite directions from the shaft; (4) a longitudinally-extending slideway construction provided at and for the outer end of each rocker bearings provided for receiving the rockable or oscillant shaft I means hereinafter arm or set of rocker arms and having a longitudinal slidable member providing part of a depending carrier support for corresponding portion of a rake structure; (5) a front support hearing for the forward end of the rockable shaft provided in and by a housing constituting part of the drive-head mechanism next referred to; (6) a drive-head mechanism supported with respect to the front end of the tank so as to have a slight angular movement about a transverse axial line and which embodies the housing structure as well as motivated means having a mechanical element for imparting spaced periodic rocking movement to the shaft and also mechanical elements for imparting spaced periodic longitudinal back and forth movements; (7) a liftable rear bearing member that receives and carries the rear end extension or lower support shaft of the rockable shaft 6|; (8) a support for th elevating referred to; and (9) an elevating means carried by said support and provided for raising and lowering the liftable rear bearing member.

The several parts listed above will be described in detail in the several paragraphs immediately following:

The classifier tank is designated as I0; means as at 9 is provided for feeding and delivering into the tank a liquid-solids suspension or mixture of metallurgical pulp containing suspended solids to be classified.

The tank It has a sloping bottom or inclined deck H from which there rise side walls l2 and I3 and at the deep end an end wall I 4 in the form of a bent plate having a lower section I5 extending at right angles to the inclined deck and a vertically-extending section I6 providing an overflow edge [1 at elevation lower than that of the dge portions of the side walls and lower than access:

5. that or the sands-discharge end or iorwardedge i8, ofmthe inclined deck H. The overfiow'edge H at the-end wall .servesas a weir. determining the normal operative overflow elevation: for liquid with suspended fine solids therein leaving the tank, and thereby determining the normal operative surfacelevel for the liquid within-the tank. An overflow receiving launderor outflow discharge means is provided at loirom which liquid rid of heavy solids passes from the tank" to the place of disposal. Raked or. classified coarser solids or sands pass asrelatively dewatered; solids from the forward upper end of the inclined deck. Th tank H) can be made of sheet metal properly stiffened but it will be ontiers-toad that it can bemade of anysuitable material-depending upon the particulartype of emplovment. There extends upwardly from and along: the inclined deck a centrally located longitudi-nally-extending partitioning rib 2! where by: there are provided right and left trough-like receiving sections as 2.2 and 23 whereinalterhate raking operations are carried out by respective rake structures 24 and 25..

Each set of rake structures includes-sets of longitudinals or stringers as 26 and longitudinally spaced transverse raking blades as 21 that are fixedly secured to the longitudinals. These blades extend downwardly to. regions below the set of longitudinals by which they are carried. Each rake structure has upwardly-extending from. thelongitudinal stringers carrier plates'or hangers as 28 whereby there may be connectedthereto depending tang portions 51 of a-longitudinal slidable member of the longitudinal slide-;

wayconstructionfl hereinafter referred to. In this; connection reference is made tothe slideway construction 32' shown in Figs. and 6 and to the detailed member shown inFig. 7.

The rocker construction. is shown in Figs. 3 and 4;- by, full lines. in a. manner to indicate its functioning. position with respect torake structures. indicated by dot-anddash lines. Those figures can well be employed in conjunction with the slideway construction showing of Figs-5 and 6 and the front. end showing of Fig. 11. The showing of: Figs; 3' and 4 are provided whereby certain novel features of a built-up rocker construction. can be. later forcibly brought-01117 by reference thereto- This rocker construct/ionisoii' rigid construction and includes longitudinal-1% spaced forwardly-disposed and rearwardly-di'sposed rocker arm members 52 each of which includes: a. shafteproviding section 55 from which there: extend in opposite directions fork-shaped sets: of rocker arms. 63-63. As constructed the tiltable. rocker embodies a built-up shaft section Edgsometimes referred to as a pivot shaft, a first shaft-providing section 55 from which the rocker armsi63 extend, an intermediate tubular section- 65', sometimes referred to as a torque tube, a second shaft-providing section 65, and lower support shaft: 6.1, sometimes referred to as the-rear shaft extension 6? which is supported in-a rear rocker: shaft bearing 1 i. This. longitudinally-extending: rocker or roclzable; shaft is. collectively designated as 61; and from the laterally branching iork-shaped rocker arms lid-63, sometimesv called cross-arms, there are supported. through the medium of pivot members as 3%. inthe outer ends; of the. forked arms. mentioned, the slide.-

wavhanger construction: 32 of Figs; a and 6 The slideway; hanger: construction constitutes an important feature of this invention as it was construction can be employed and wherebylongi tudinal reciprocating-movements can beimparted tothe rake structuresin directions parall'elingthe longitudinal axis of the oscillant shaft, i and it' is therefore in order to. describe this construction at this time. Said slideway hanger construction, thus generally. designated as 32,-.constitutes a rake-carrying structure which is interposed tween the outer ends of each pair of the forkshaped rocker'arms 63' and a corresponding portion of the rake structure-whichis carried therefrom. The-outer ends of the arms are boredzso as to receive thepivotmembers Sireferredfio and-.vwhichpivot members in turn receive and through the "medium thereof support apertured' trunnions 35-35 of alongitudinally-extending body member 33 of the: slideway hanger construc tion 32.

This slideway hanger construction 32 is shown in generalfiarrangement and detail inFigs. 5 to 10 inclusive It embodies the body member 'ss justreferred to. The body member haslongi tudinally apertured trunnions 35-35 which: aremounted in the pivot members itc provided to receive them. The openings in the trunnionsare inaligmnent with openings provided in the-pivot members 36. The body member tt hasacrosshead cover '4T detachably secured thereto as bybolts. Eachbodymember et has parallelsupporting guideways to uponwh-ich there are mounted longitudinally movable slidable mem bers 4| that include shoe members 42 havingaunderlying anti-friction bearing members e3 resting. uponand slidably engaging guideways Ed. The

slidable member 45 also includes cross-head caps 45 topped-by anti-friction guide blocks 46 disposed for engaging the underside of thecrosshead cover 41. The slideway hanger construe" ticn has a-cross-headmember 58 (see Figs-'Tto 11) provided with lateral trunnions 5i mounted in the slidable members ill so that a tang portion 5tof the member 48 depends from the trunnionsupported portions Ell-til thereof. Thiscrosshead member 4&has a body portion 59 fromwhictithe lateral trunnions 5c extend. These trunnionsarereceived' and maintained in circular bearings provided therefor by the shoes 42' and caps-45 and which collectively constitute parts ofthe slidable members M. The caps G5 are secured in place relative to the shoes 12 as by screws- The cross-head member Qthas its tang portion 5|- extending from the trunnion supported" body thereof to a region below the body merinber 33'of the" slideway construction. This depending tang 51' has a series of bolt-receiving openingsfiz whereby the lower end of the tang can. be clamped and fixedly secured as by bolts 53to the upper'jends oi the upwardly and i'nwardl'y inclined. carrier plates .28 of a. portion of the. rake. structure. Filler or spacer pieces 2-9 indicatedin. Figs. 5 and. 6 canbe interposedbetween;

the; depending tang portion on the one hand" and the upwardly andinw-ardly inclined carrier-plates on the other hand. Since each: cross-headguide is mounteiiithrough' the medium of the longitudinatiap'ertured trunnions 35-35 there are provided means :by which, as the rocker 61 istilted-about its inclined longitudinal axis in one direction, one of the rake structures is suspend-- ingly supported in low position therefor "for longitudinal forward movement as by theup-'-' deckstrokewhile the other rake structure is suspendingl'y supported in raised positionthere designed whereby an oscillant rig-id arm-rocker 'z si for -tor longitudinal rearward-non-raking'move ment preparatory to subsequent lowering into low forward raking position.

According to this new form of slideway hanger construction 32 it will be noted that there is permitted a pivotal movement of the slideway construction about the trunnion axis mentioned as the rocker arms are swung up or down, as the case may be, and also there is, provision for a limited relative pivotal movement asbetween the depending cross-head 48 and the slidable member 4| because the lateral trunnions of the crosshead are mounted in circular bearings provided in and by the shoes 42 and the caps 45;

The slideway construction as employed has an upward and forward inclination in general longitudinal direction. Accordingly, one of the pivot members 36 is located at the high forward end thereof and the other pivot member is located at the low rear end thereof. To the forward pivot member there is secured and carried an upstanding oil cup 30 for supplying lubricant through the apertured trunnion of the body member 33 for lubricated slideway and the lower pivot member is provided witha depending oil receptacle 3I for receiving lubrication passing from the slideway construction through the apertured portion of the trunnion member whereby it can be collected in the latter receptacle. This oil receptacle is preferably provided with a valvecontrolled discharge means leading therefrom. By the oil supply cup 30 and the depending oil receptacle 3I the movable elements of the slideway construction can be lubricated by the means of support therefor and can readily be maintained lubricated.

In the Figs. 5 and 6, there is also shown a Wrist pin carried in wrist pin supports 56. These wrist pin supports have cylindrical bearing members 51 for receiving the outer ends of the wrist pin and these bearing members 51 have welded thereto longitudinally-extending members 53 angle shaped in cross-section and secured to upwardly inclined rake hangers 28- 28 as through the medium of bolts 59. The rear. end 54 of one of the connecting rods I23 or I24, as the case may be, is mounted on the wrist pin 55 and as the apparatus functions the connecting rod imparts the forward or rearward longitudinal movement to the rake structure to which it corresponds. V

The drive-head mechanism or drive unit assembly, as it may be called, is illustrated by Figs. 1% to 18 inclusive. Its use and place of employment is further exemplified by reference to Figs. 1 to 4 inclusive and also to Fig. 1. In this comiection one should bear in mind that Fig. 11 is a view of the forward end of the classifier looking in a rearward direction and that the drive-head mechanism is in the foreground.

The important features and parts shown'in the views of Figs. 12a to 14 comprehend the gear housing or cage 90 embodying right and left side sections IllI and I02 connected into a gear casing unit by bolts I03 extending through flange portions I04-I 04 thereof.

This housing provides longitudinally aligned bearings 93 and 94 (see Fig. 1d) for receiving the pivot shaft 64 which functions as a front endv section of the rocker shaft SI. In connection with the foregoing also see Figs. 3 and 4.

a Support tubes 05 and 96 are secured to and extend from the housing sections IOI and I02.j The support tubes 95 and 06 are in turn supported in aligned but transversely spaced ped estal bearings 91 and 98. The pedestal beari by bolts H0 and E20 crank pins are arranged 180 ings 91 and 98 are in turn supported on the front end portion of the side walls of the tank through the medium of spacer members or spacer blocks and all are secured in place by bolts I00 (see Fig. 11). The pedestal bearings 91 and 98 establish a transverselyand horizontally-extending axial line about which the drive-head mechanism can have a limited angular movement and which angular movement is requisite when the rear end of the rocker parts carried thereby are to be lifted or raised. -.The drive-head mechanism embodies gearin including (1) a motor actuated transverse pinion shaft I05 havin thereupon pinions I01 and I08 which are gears of small diameter and preferably of the herringbone type; (2) large driven gears I00 and H0 are arranged so that the herringbone type of teeth thereof are in meshing driven engagement with the pinions or small gears I01 and I08; (3) a cylindrical cam I06 disposed between and connected to the large driven gears I09 and I I0 so as to be concentric therewith; and (4) crank shafts III and II 2 having flanged inner ends H3 and II 4 connected to, concentric with and driven by the large gears I09 and I I0; these shafts are turnably mounted within and extend outwardly through anti-friction bearings IIS and I I6 provided in and carried by bearing rings i H and I I8 which are secured as whereby to constitute part of the housing 00. The result of the construction just described is such that the crank'pins 1 2| and I22 of the crank shafts II I and H2 are located outside of the casing or housing 90. These apart. The drivehead mechanism also actuates rearwardlyextending connecting rods I23 and I24 of which the-forward ends I25 and I26 have driven connection with the crank pins I 2I and I22 of the crank shafts II I and II2, while the rear ends of the connecting rods (each rear end being designated 54) have driving connection to the rake structures through the medium of the respective wrist pins 55 mounted in the Wrist pin supports 50 carried by the rake structures to which a particular connecting rod corresponds.

The crank shaft II I, the driven gear I09, the cylindrical cam I06, the driven gear H0 and the crank shaft II2 are thus serially arranged and are connected in-transverse axial alignment into a composite rotary structure that is mounted forturning movement as imparted thereto by pinion gears I01 and I08 on the actuated drive pinion shaft I05, but so as to be restrained against any substantial play in transverse direction because of the construction of the anti-friction bearings II 5 and II 5 as supported in and carried by the transversely spaced crank shaft bearing rings I I1 and II 8 provided for receiving and holding the anti-friction bearings I I5 and H6. Tapered pins I00 -function as positioning members for assuringproper alignment of the side sections ml and I02 as and when they are screwed together by the several bolts I 03.

A requirement of the housing 90 is such that whil it is supported for permitting slight angular movement thereto about a transverse axis as determined by the support tubes and 96 which are mounted in the side or pedestal bearings 91 or 98, nevertheless, it must be of a rigid type of construction such that the axis of the crank shaft and the axisof the drive pinion shaft I05 will be parallel whereby proper tooth engagement will b realized as between the pinions I01 and I08 75- on the drive pinion shaft on the one hand and the sprayer teeth of the large drive-gears I09and M on the other hand.

With respect to the two small pinion'sfll? and I08 on pinion shaft iQiand the two-large drive gears $53 and H3 or the composite assembly referred to, it will be noted that they are preferably provided as coordi'natedly disposed setsof gears of herringbone type of construction'whereby the right and left hand type of. pinions I0? and I05 respectively mesh with leftand right hand type of drive gears M9 and IliL-thus assuring an arrangement in which there is attained a tendency for the set ofgears and set of pinions to constantly remain in an arrangement according to which balanced driving-ofthe large gears i 25 and IIEI'from pinions Ililand M13 is attained and whereby there-is avoided any tendency fOr substantial bodily-movement in an axial direction of the pinion shaft 1 05 even through the anti-friction bearings ii and I28 provided for the pinion shaft lill are non-fixedly mounted in aligned openings I3! and I32 provided therefor in and'by the housing sections IBI and 02.

It is in order to digress. for the moment for the purpose of explaining that the drive pinion shaft I05 is actuated'from a motor which is outside of the classifier through ai speed-reducing and power-transmission meansembodying belting I59 driven from the rotor of the motor and. a shaft pulley r55 mounted on ashaft I52. (In this connection see Figs. 1, 11 and 12b.) The shaft extends into the support tube 85 and is mounted in an anti-friction bearing I51 which in turn is internally mounted within the outer end portion of the support'tube 95;- The inner end of the shaft I52 is splined and there-is a spline sleeve I33 that provides a driveconnection-between the inner splined end of shaft l52 and a splined end of pinion shaft-I05.

The outer end portions of the-support tube are provided with oil-sealing caps secured 1 thereto, namely, there is a sealing cap I53"for" the support tube as and asealing'cap I54 for the support tube 96.

Reverting to the cylindrical cam Hi3, it'will be noted that it has a grooved'profile I33 for receiving, a cam-actuated roller: i315; This roller is turnably mounted at the low swinging end 535 of a. roller-carrying arm I36'which forms a separable connection between the cam and the rockable shaft 6% and is carried at and yieldably secured to the pivot shaft lid-constituting aforward extension of the shaft Bl. This cam rollercarrying arm I35 is normally firmly, although yieldably, seated'against resisting portions ISL- I3? provided on the pivot shaft 64 at the underside. thereof and the arm is normally held quite rigidly in'place. through the medium of a pair of eyebolt type of tension rods i38'-l33 continuously maintained under. tension bycompression springs 139-435 respectively surrounding the rods. These eyebolts pass upwardly through a portionof the piv'otshaft. The lower ends of said springs rest. in depressed seat portions I tit-1 ts in the upper surface portion of the pivot shaft and the upper ends of said springs. engage the underside of a spreading plate forming an upper spring seat member I4! that is held in spring compressing position by nuts Hl2--i2 thatare adjustabiy positioned on the upper por tion of the tension rodsreferred to. The lower ends cf these lensionirods have-eye-portions M3 for receivinga pin hltwhich passes through a section we of the-upper end of the roller-carrying arm 136. Depressed ortions 153-443 at the upper end of this roller carrying -arm forcibly engage the resisting portions I3L-I3'I at the underside of the pivot shaft. In thefcrm shown the resisting portionsi3T-I3l' are'providedby longitudinally-extending projections resembling parallel ribs with curved undersurfaces; These ribs are transversely spaced with respect to each other and the curved faces are received in-the cooperatively depressed portions i lfi just referred to.

In Fig. 13 the partsjust referred to are shown in a position which the roller-carrying arm I36 normally occupies during non-overload operating condition.

In Fig. 15 there is shown a-position typifying that which the roller-carrying armcan occupy relative to the pivot shaft should anabnormal overload or obstructing condition beencountered. This position indicates what 'istermed a break or yielded or separated position-for the arm. As soon as overload operating conditions have been overcome the compression springs I39-I39*force the separable roller-carrying" arm I36 into normal position therefor.

It has already been indicated that the rocker 6e embodies the rockable shaft 6! and rocker arms 63 which are'fixedly and rigidly connected as parts thereof. There hasalsobeen brought out how the rocker armsextend outwardly from the rockable shaft'and therefore function priodically to raise and to lower-the rake structure as required through the medium of "longitudinal slideway constructions as 32- and also --whereby because of the latter the rake-structures aresupported so as to be moved inforwardandrearward directions as part of cyclic paths through which each rake structure travels during the successive operative movements thereof.

There has also been described the drive-head mechanism which comprises a cylindricalcam I96 that constitutes part of a driven-rotary memher which is coordinately disposed for actuating the roller of a roller-carryingarm that'is connected to a forward end portion of the rockable shaft, namely, to the forward pivot shaft section 46 thereof whereby toimpart'the requisite rocking or oscillating movements to the rocker shaft.

There have also beenmentioned crank shafts which have been described asconstituting 'part of the rotary member whereby through the medium of connecting rods connected tothe'ends of the crank. shafts and to the respective'rake structures thelatter canbe moved back and forth in the proper manner-one with respect-to the other.

It is believed, however; that amplification. of the description of the cylindrical cam I06 which has a peripheral groove of360' angular degrees and this mode of operation for performing the work required of it can be further exemplified by reference to Figs. 16 .to 18 inclusive.

The cam I96 with its peripheralgroovel33.is illustrated in Fig. 16 which is a view looking in a rearward directionat. the camp In. this connection it will be noted that Fig. 17 is a horizontal sectional view ofthe peripheral portionof the cam taken on a plane indicated by the dot-ands dash line II-Il looking in an upwarddirection indicated by the arrows, and that Fig. 18. shows a development of the grooved profile I33 of the cam.

As already pointed out and in connectionv with Figs. 12a to 14 inclusive, itwill be seen how the pivot'shaft' 64 constituting the front endof the rockable shaft BI, the roller-carrying arm I 36 and the roller I34 at the lower end of the arm (which roller enters the groove I33 of the cam) cooperatively function and from the preceding description it will be apparent:

(a) When the roller I34 is in the dwell section I of '10 angular degrees of the profiled groove that the right rake structure is held in low forward raking position while being moved forwardly by the connecting rod provided between the outer end of the right crank shaft and the right rake structure;

(17) When the roller I 34 is in the reverse curved roller actuating section 2 of 110 angular degrees of the profiled groove that the roller is then being actuated to swing the rockable shaft 6I so as to elevate the right rake structure and to lower the left rake structure;

() When the roller I34 is in the roller dwell section 3 of 70 angular degrees of the profiled groove that the left rake structure is then in its low forward raking position while being moved forwardly by the connecting rod provided between the outer end of the-left crank shaft and the left rake structure; and

(d) When the roller I34 is in the reverse curved roller actuated section 4 of 110 angular degrees of the profiled groove that the roller is then being actuated to swing the rocker shaft so as to elevate the left rake structure and to lower the right rake structure to low position for foward raking operation when and while the roller is in dwell section I. of course, it will be realized that when any one of the associated right and left rake structures is in low raking position and is being moved forward by a crank and connecting rod mechanism corresponding thereto, the other rake structure is being moved rearwardly in high return or non-raking position therefor.

The bearing H is provided for receiving and carrying the rear end extension 51 of the rocker shaft 6|. This rear enclextension is sometimes referred to as the low support shaft of the rocker. The liftable rear bearing H is indicated in Figs. 3 and 4. Its location with respect to the rear end of the rocker and other structure in the vicinity thereof and particularly with respect to supporting structure for the elevating means hereinafter described is clear from the showing in Figs. 21 to 25.

The liftable bearing 1I derives its entire support through the medium of the elevating means and the latter in turn derives its support from a stationary structure fixedly positioned with respect to the tank as will presently appear.

The support for the elevating means is of a rigid construction and is afforded by a structure which includes upwardly-extending side members 86-86 fixedly positioned with respect to the tank, a transverse tubular carrier 81 connected as by welding to the upper ends of the side members 85-86, short transversely spaced forwardly-extending members 88 having a weld connection to the tubular members 81, an upper set of transversely spaced upwardly-extending members 89-89 which are secured to and rise from forwardly-extending portions of 88-38 and a horizontallyand transversely-extending top plate member 19 carried at and secured to the upper ends of members 89-89. The plate member 19 just referred to constitutes a table top upon which a base 83 of a cylinder of the expansible and contractible lifting means is fixedly secured in any suitable manner. The tubular 12 cross-member 81 also carries a set of transversely spaced blades that provide rearwardextensions 200 for supporting the set of'depending members ZBI which serve as means by which the forward end portion of the feed conduit 9 derives its support.

As to the means for raising or for lowering the elevatable rear bearing H for the rocker shaft 6|, this is provided by a raising and lowering mechanism of a hydraulic type and is collectively designated 14 and is carried by the support structure just described. The hydraulic type of lifting means 14 referred to is typified by a construction embodying a liftable piston 15 located in a cylinder 16 in which a rising or upstanding piston rod 18 of the piston extends through a cap member 82 located at the upper end of the cylinder. The lower end of the cylinder 16 rests upon and is connected to the base 83 which provides a lower head for the cylinder. Pressure fluid for actuating the piston may be supplied from any suitable source of liquid supply as through the medium of pipes 84 and 85 because of 'fiowpaths provided in or by the cylinder base 83, the cylinder 16 and the cylinder cap 82.

The liftable bearing H at and for the lower rear end shaft section 61 of rockable shaft 6| is supported from the liftable piston 15 through the medium of a liftable yoke or cross-head 11 carried on the upper end of the upstanding piston rod 18 of the piston 15, depending rods 13 of eyebolt formation of which the upper ends of the rods 13 are adjustably'carried by nuts 8| resting upon the lifting yoke and of which the low eye portions of the rods 13 receive and support lateral trunnions extending outwardly from the liftable bearing 1I.

With respect to this rear bearing construction it is to be noted that there is preferably interposed a bushing between the rear end of the tiltable shaft and the supporting bearing 1I therefor. It will also be noted that the cylinder and piston with piston rod extending upwardly therefrom are disposed so that the center line common thereto extends in upward direction approximately at right angles to the longitudinal axis of the rockable shaft when the latter is in its normal low position.

In apparatus of the type disclosed where parts thereof require lubrication, this may be accomplished either by oiling systems designed where by to supply oil therefor from a central location or oiling means provided at and for oiling individual bearings.

In apparatus where cranks 'or other moving parts are exposed it is advisable to supply shielding means or guards to protect operators from injury. Therefore, for practical operation it is preferable to have such parts either enclosed or provided as by shield members.

In the preferred form the gearing mechanisms have been enclosed in the housing structure 90. Also in said preferred form there are indicated shield members 38-38 the location of which is shown in Figs. 1 and 2b, namely, in the region immediately ahead of the crank shafts and the connecting rods which are connected thereto and driven therefrom.

The gear housing generally designated as 30 is constructed so as to provide inspection or access openings, as for example, for the housing side IOI there is normally sealed inspection opening I51 having a removable cover plate I59 and for housing side section H12 there is a normally sealed inspection opening l58 having a, removablecover plate I68. housing there is an aceessopening. Hit. normally closed by removable. housing cap. I62.

The gear housing so is splitalong a vertically and longitudinally-extending plane. The side sections lol and I92 thereof have shaft bearings that must be in. proper alignment. The housing and gear thereof as made require thattherebe provision for ready, prompt andaccurate. assem-r bling or re-assemhling of the several parts. embodied in the drive-head mechanism, as for example, to assure the proper alignmentor location of the several shaft hearing parts relative. to each other. To that end there havezbeen provided a plurality of tapering pinsas I30 whichextend through contacting flanges of. said side sections and which pins can be relied upon for properly locating and for maintainingin proper location one housing side sectionrelative to the other prior to and durin the pulling of said sections together by the several bolts I03. Taper ins pins and bolts may also be employedwhere other bolt connected partsare to be assembled or reassembled. In Figs. 24 and 25 there is illustrated thatwhich may be considercdas a perspective view'ofa form of classifier construction modified as to detail as compared with the preferred form of classifier already described. This modified form, however, embodies certain and in fact many of the. intportant novel characteristic features of the preferred form.

The perspective view of Fig. 25 may. be described as a view looking at the forward high end of the. classifier in a direction slanting laterally --I rearwardly and downwardly towards the classifier. In this figure there is illustrated the forward or high sands-discharge endof the tank. In. hav

ing an upwardly sloping bottom 1 land side-walls. l2 andls extending upwardly therefrom. The

tank has a centrally locatedv partitioning rib 21 rising from the bottom. Rake structures and 25 are operatively disposed respectively inthe spaces between the partitioning rib and theside walls of the tank. Each rake structure has up wardly and inwardly-extending hangermembers or carrier plates 28. These carrier platesare sup! ported from the outer. ends 269- 259. offorked arms 253 of the rocker constructionlfiflthrough the medium. of slideway hanger constructionsziaz v corresponding to the slideway hangerconstrum ticns 32 previously described, In this connection it will also. be noted that the slideway: hanger constructions 32 have trunnions35at the ends thereof mounted .in openings provided at andlin the outer ends 2527-259 of said arms Wherebythe slideway hanger constructions canhave slight angular movement with respect toa longitudinal axis the rake ructures are. raised or l wered because of a tiltingmovement imparted. to th rocker construction.

The rocker construction Ztfi'indudesa longi= tudinally-extending shaft 25! providing a front end section or pintle shaft 264 that is mountedin bearings and. 29s of a. cage or skeleton hous ing 2253i}. housing has a transversely-extends ing supported bearing portion 295, which is mounted on and so as to have a slight b il pivotal movement imparted thereto about a transversely-extending motor driven shaft 252 which. in turn is mounted in pedestal bearings 298 and 25? This motorv driven shaft 252 is actuated from a motor, not shown, through the medium of dp ddeducingand power transmission mecha= membodying .a inch 25.5 operable: for drivingia 13 Also at the top of: the

large-pulley ZSG-seeu-redin place-"to a portionio! the shaft that. extends into a region: outsideeof the tank. The-pedestal: bearings 298-and..29 rest upon spacer'blocks. 300 andflfitwhkhate supported on top flange portions .of the cornspondingsides 12 and I3 of the tank. The pedestal hearings andspacer'blocks are secured-in place on the flange portions of the tank as rby bolts 392 and 303.

The transverse shaft 252 functions notconly to support the cage or housing 290, but'also as a drive shaft to which there is secured a-small drive pinion so? which in turn' isprovided for imparting turning movement to a large: driven gear 309. This large driven-gear 399 constitutes part of a composite driven rotary unit 308 which embodies in serial arrangement crank shaft 3!" at one end thereof, the large driven gear 309, the cylindrical cam 38% and a crank shaft 3!! at the other end thereof, and all of which are connected in axial alignment. The crank shafts 3H] and. Si! have at the outer ends thereof crank arms as 312 from whichlaterally extend crankgp ns 322 at the outer endsthereof. These crankshafts are assembled in the composite rotary. unit in manner whereby the crank arms thereof. are-at 130 degrees relative to each other.

The skeleton housing 298 has bearing portions 3M and Bid for receiving the crank shafts of "i the rotary unit. 388 and also employs bearing caps as Sit and 31? which. are detachablyusecured in place and which serve to maintain the rotary unit 3138 in operative position.

The rotary unit 368. is so mounted in the skeleton housing as toprevent any substantial play of the unit withrespect to the housingcin directions parallel to the motor drive shaft 252,

Also in connection with the foregoing, itwill be noted that there are provided collarsdfifiand 261 disposed adjacent the pedestal hearings 298 and 299andso secured to the shaft 252 as=to prevent anyv substantial play of said shaft in said bearings in a direction in which the shaft extends. Likewise, collar portions or collarsilll and 2'?! are located on and secured to the shaft 252and are so disposed with. respect-to the-bean ing portion 295 of the skeleton housing- 'whereby to prevent any substantial play or movement of said cage or housing 290 in directionparallelto the shaft 252. 1

It has heretofore been pointed out how the rocker construction generally designated .as 2 551 embodies the oscillable longitudinally extending shaft 261 from which thereextends theset'of fork-shaped arms 263, namely, in directionsas to the right and to the. leftfrom the shaft 281 and which are so connected to the rocker shaft as to movetherewith when itisrocked.

It is also to be noted that in the structure-as illustrated connectingrods as324. are: actuated fromthe crank pins 322 of. the crank shaft'and that they are also essentially connected. insult-r able manner as through awrist pin, or: the equivalent, to the upwardly and inwardl inclined carrier plates 23 by and from which the rake structures are supported from the longitudinally-extending slideway constructionfsh It will he noted thatithedrive pinion Stfmeshes with and imparts turning movement to the driven gear ace of: the composite construction whereby when said driVen'gearLSGe turns ther. is: imparted turning movement toboth the cam on theone hand: and the associated crank shafts s-lfl cn.the' other hand. The cam SoE- has a profiledi groove. portion which embodies the' struo tural and functional characteristics of the cam 306' of the preferred form. In the modified form under consideration there is a cam-actuated roller 334 which is disposed within the profiled groove portion of the cam 336. A roller-carrying arm 336 is connected to the shaft 264 so that as the cam turns it functions to impart in periodic order through the medium of the cam-actuated roller 334 and the roller-carrying arm 336, the requisite movements to the shaft 264 and thereby to the rocker construction 260. The cam 306 is functionally positioned With respect to the roller 334 and the roller-carrying arm 336 on the one hand and to the crank shafts 3m and 3 I I on the other hand whereby there is obtained the coordinated raising and lowering movement of the rake structures by the rocker construction as it is actuated and whereby the rake structures are longitudinally moved in proper timed manner requisite for their proper operative movements. Also in connection with the modified form of Fig. it will be apparent that the rocker con- 'struction 269 and the longitudinal shaft 26I thereofeach of which is shown only as to the forward portion thereof-can be provided with supporting and lifting means at the rear end thereof by the construction employed and shown with respect to the preferred form as already described.

This application has been divided out from my co-pending application Ser. No. 263,892 filed December 28, 1951, now Patent Number 2,647,631, which is drawn to the rocker construction and the slideway hanger construction, whereas this application is directed to the drive-head construction. Ser. No. 263,892 filed December 28, 1951, now Patent Number 2,647,631, is in turn a continuation of application Ser. No. 88,619, filed April 20, 1949 now abandoned.

5 I claim:

1. Drive-head apparatus for a raking classifier that has a tank with sides and bottom together with a cross-arm carrying rockable shaft supported longitudinally of the tank and a rake structure supported from the arms on each side of the shaft having a sliding support between each rake structure and the cross-arms from which it is supported, which comprises a cam mounted transversely of the shaft, drive means for rotating the cam, a crank operated from each side of the cam with one for each rake structure, and means operable by the cam for rocking the shaft, including aligned but separable elements normally acfing to hold the elements against separation.

2. Drive-head apparatus according to claim 1,

wherein one of the separable elements carries a roller coacting with the cam and is pivotally supported from the rockable shaft. 3. Drive-head apparatus according to claim 1, wherein one of the separable elements carries a roller coacting with the cam and is pivotally supported from the rockableshaft while normally spring-pressed toward the shaft.

4. Drive-head apparatus according to claim 1, wherein one of the separable elements is substantially triangular.

. 5. Drive-head apparatus for a raking classifier that has a tank with sides and bottom together with a cross-arm carrying rockable shaftextending longitudinally of the tank and a rake structure supported from the arms on each side of the shaft having a sliding support between each rake structure and the cross-arms from which it is supported, which comprises a casing between two casing-supports that derive support from the tank sides, a cam in the casing, drive means therefor extending thereto through one of the casingsupports, a journal in the casing for rockably supporting one end of the shaft, a roller coacting with the cam and an arm carrying the roller pivotally supported from the shaft.

6. Drive-head apparatus according to claim 5, with the addition of spring-pressed means for separably connecting the roller-carrying arm with the shaft.

7. Drive-head apparatus according to claim 5, with the addition of two spring-pressed devices for separably connecting the roller-carrying arm with the shaft in a plane such that the roller lies vertically between the spring devices.

8. Drive-head apparatus according to claim 5, with a gear on each side of the cam of which each is driven by the driving means.

9. Drive-head apparatus according to claim 8, with the addition that there is a crank for operating each rake structure, and connections are provided between the gears and the cranks extending through the casing so that each crank is driven by one gear.

10. Drive-head apparatus for araking classifier that has a tank with sides and bottom together with a cross-arm carrying rockable shaft supported longitudinally of the tank and a longitudinally movable rake structure supported from. the arms on each side of the shaft having a dependent support between each rake structure and the cross-arms from which it is supported, which comprises an endless grooved cam mounted for turning movement about an axial line extending transversely of the shaft, drive means for rotating the cam, an outwardly-extending crankpin carrying arm operated from each side of the endless groove of the arm with one crank arm for each rake structure, a connecting rod between the crank-pin for and at the end of each crank arm and the rake structure corresponding thereto, and means operable by the cam for rocking the shaft provided by an arm extending laterally from the rockable shaft and equipped at the free end of the arm with a roller operatively disposed with the groove of the cam.

, 11. Drive-head apparatus according to claim 10, wherein the laterally-extending arm embodies yieldable spring-held separable elements of which the outlying one carries the roller. 12. Drive-head apparatus according to claim 10, in which the laterally-extending arm embodies separable displaceable elements movably held in non-displaced position with respect to each other by yieldable spring elements.

13. Drive-head apparatus for a raking classifier that has a tank with sides and bottom together with a cross-arm carrying rockable shaft extending longitudinally of the tank and a rake structure supported from the arms on each side of the shaft through the medium of means having a sliding support between each rake structure and the cross-arms from which the sliding support is carried, a casing pivotally mounted on a horizontally and transversely extending pintle providing means that derive support from the tank side, a continuously grooved cam turnably mounted in the casing, drive means therefor deriving certain support from the casing, journal means in the casing for receiving and rockably supporting a forward end portion of the rockable shaft, a roller coacting with the cam, an arm extending laterally from the shaft and carrying from the swingable end thereof a roller that engages and is actuated from the arm means for lifting the rear end of the shaft, a pair of cranks supported by the casing and movable in unison with the cam with the crank ends of the arms being disposed 180 apart, and a. pair of connecting rods with one rod for each crank providing a connection between the crank pin to which it corresponds and having a driving connection to the slidably supported rake structure to which it corresponds.

References Cited in the file of this patent UNITED STATES PATENTS Number 

